Unsteady flow simulation using newly developed parallelCFD program with pseudo-time sub-iteration method

摘要

In the last decade, AHL(Air-breathing Hypersonic-Propulsion Laboratory) of CARDC(ChinaAerodynamic Research and Development Center) has developed a massively parallel CFD softwaresimulate the phenomena of vehicles in hypersonic conditions. This CFD program have the abilities tosimulate the steady or unsteady flow in laminar, turbulence or multi-spaces chemical reactionconditions. This paper focuses on the use of unsteady flow technique to simulate the shock wavemovement and its interaction with vortex around a corner and over a wedge under the condition ofM=1.49,T0=Tw=300K,P0=101300Pa. With computational interference technology (CIT), thecomputational density field is transformed into numerical interference pictures and compared with theinterference pictures obtained in experiment, proving the reliability of numerical results. From thenumerical results, it is also observed that the shock wave does not break off and a part of the shockwave is accelerated while the other part is decelerated when it passes over a vortex. The experimentswere carried out in the shock tube of the Facility Design and Measurement Technology Institute(FDMTInst.) of CARDC.